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Lymphocyte Cytotoxicity of oxLDL in Patients with Atherosclerosis.
MedLine Citation:
PMID:  21427493     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
Background: Atherosclerosis, a chronic inflammatory disease of the vessel wall, is characterized by local and systemic immune responses to a variety of antigens. Oxidized low-density lipoprotein (oxLDL) is considered as an important determining factor in the pathogenesis of atherosclerosis. Objective: The purpose of this study was to investigate the degree of peripheral blood mononuclear cells (PBMC) vulnerability to in vitro oxLDL-induced cytotoxicity from atherosclerotic patients in comparison to healthy individuals. Methods: Thirty patients with atherosclerotic lesions, confirmed by angiography, and 30 matched healthy individuals were investigated. PBMC was prepared from individuals' blood samples which were further stimulated with low dose (1 μg/mL) and high dose (50 μg/mL) of extensively oxidized LDL. MTT assay was utilized to measure cell viability and proliferation. Stimulation index (SI) was calculated as mean ratio of optical density (OD) of the stimulated cells divided by OD of untreated cells. Results: Low dose oxLDL treatment caused no significant proliferative or cytotoxic effect in the control group; however, similar treatment caused significant cytotoxic effect in the patients compared to the controls (p=0.026). High dose oxLDL treatment induced more significant cytotoxicity in the patients compared to the controls (p=0.006). Comparison of the SI between the two groups of patients and controls showed significantly lower index by either the low (p=0.03) or the high dose (p<0.001) oxLDL in the patients compared to the controls. Conclusions: PBMC from patients with atherosclerosis showed increased susceptibility to oxLDL-induced cytotoxicity. Our results imply that prolonged exposure to elevated levels of circulating oxLDL could weaken the cellular defense mechanisms by progressive depletion of the pool of antiapoptotic proteins, rendering the cells more vulnerable to oxLDL-induced cell death.
Authors:
Mohammad Jafar Mahmoudi; Maryam Mahmoudi; Fereydoon Siassi; Fazel Shokri; Mohammad Reza Eshraghian; Amir Hassan Zarnani; Reza Chahardoli; Mona Hedayat; Jalal Khoshnoodi; Hashem Nayeri; Nima Rezaei; Ali-Akbar Saboor-Yaraghi
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Iranian journal of immunology : IJI     Volume:  8     ISSN:  1735-1383     ISO Abbreviation:  Iran J Immunol     Publication Date:  2011 Mar 
Date Detail:
Created Date:  2011-03-23     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101282932     Medline TA:  Iran J Immunol     Country:  Iran    
Other Details:
Languages:  eng     Pagination:  27-33     Citation Subset:  IM    
Affiliation:
Department of Nutrition and Biochemistry, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran, e-mail: asaboor@sina.tums.ac.ir.
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